Blowpipe



H. w. JONES BLOWPIPE Filed April 19, 1945 INVENTOR HOMER W. JONES BYATTORNEY Patented Oct. 4, 1949 hair-ED STATES PATENT orrice nearerW.-'.FOIiS; Westfield, N. Ji, -ass ignor to Tlie -Linde Air ProductsCompany, a corporation of "Ohio Application April 19, 1945; "serial in.$89,132 4 Claims. (01. 1-5s 27:-4)

This inveh'heh relates to hioivpipes, and more particularly to blowpipenozzles, theforv/ard'ends of which engage and are guided by a surfacewhich is acted upon by a stream discharging from the nozzles.

In certain'nietal-working operations, e.'g., when deseahnh steel billetsand the like, the work surface is heated to ignition temperature and anoxi dizingjgas stream is applied obliquely against successive portionsof the so heated'metal'surface "to remove metal from such surface. 'Nozzles employed for this purpose usually include an oiiygen passageextending along or parallel with the axial center line of the no-zzleand-a series of heating gas passages parallel with the large oxygen passageor convergingtowardthe forward end of the nozzle; and usually, but notnecessarily, spaced circumferentially about the oxygen passage.

The nozzle is usually held so that its axis is obliquejand makes a sharpangle with thesur fac'eof the workpiece and the'noz'zleis 'guide'dib'yand'p'iished along the workpiece in the dire ctidr'i 6f the issuingoxidizing gasstream, thus wearing away the front periphery and theperipheral porti onsbehind the frontface ofthe nozzle body and exertinga rearward thrust against the latter, Such guidance of the nozzle bycontacting its end with the metal surface is especially 'des'i rablewhen hand-operated deseaming blowpip'es are moved along the surface tobe deseamed because the preheating and oxidizing jets may then bemaintained in accurate positions with respect to the work surface duringrelative movement, irre spective of the surface contour of the w n;Thus, uniform removal of metal along the surface can be accomplished. sV y Rapid wear and deterioration will'o'ccurjatfthe periphery of thenozzle adjacent but behind'its front face when such peripherycontinuallyen gages the surface of a workpieceto guide the nozzle whileheld obliquely against the workpiece, especially during a deseamingorotlier thermoe chemical operation, because Qfthe-intense-heat adjacentthe nozzle andin contact with the-work.

In accordance with prior art there has been provided a deseamingblowpipe nozzle com rising anelongated body of metal, such as-copper,having oxygen and combustible gas passagesextending longitudinallytherethrough, said passages having their outlets in the front face ofthe-body which has a substantially cylindrical outer sur-, face; andaprotective-metal collarpermanently v teasing ardiihdthe same behindbuted- Jae t the rrent end face thereof. The collar comprises "a metalringwhich is relatively thick radially an" has a'substantially greateroutside diameter than thecylindrical surface ofthe body adje'ihi thering which consists throughoutof lav'ih'e greater wear resistance thanthe metalof the body,- an outer circumferential portion of the ringadjacent its periphery having greet-er weer resistance than "the portionof the ring closer to the body; The ring is permane'htly secured to thebody-by arelatively thin layer of bonding metal united to and coveringboth the entireinner peripheral surface of the ring-and thecorresponding opposed outer surfaceportionof the body within the ring. I

Des'e'ai'ning nozzles thus 'are provided with a wearing "ring-of hardmetal on the front end for the nozzle to ride eh ehdt protect the frontend. Such-rings have in the'pa'st been fastened to "the nozzle by silversolder or by spinning or the front vend become marred, trimming off-isneeded. This is difficult because of the hardring. Furthermore, theringis shortene'd andbecomes less strong. and wears out sooner. shame thering emek in use, which freduently happens, replacement becomes a ai i hso v. A ;'I he i ain objects of this invention are to cpro-j vide noveland i'mproved means for overcoming disadvantages and difliculties of theprior, art; a desea'min'g blowpi-pe having a nozzle protected byas'leevewhich is annularly spaced from and adjustable axiallywithrespect to the nozzle; and nozzle protective means that isinexpensive to manufacture and maintain compared to 'the'prop'dsals ofthe-prior art. g I According to-the-invention, a novel coupling'isprovided that bears against the shoulder, of the nozzle and holds thenozzle inthe 'blowpipe head. Suchcoupllng also has a socket providedwith an internal thread at-its' far end which receives aprotective-sleeve orw-tube'which-is' threaded into the coupling untilits o'uterend hat a desired ldc'atioii with respect toithe outer end ofthe nozzle. 'FOr exainple, it may be adjusted farther eart n the nozzleend, thereby enabling an 6i- 1'iiaiy Gil- 12nozzle to function well onfuel gas? uch' hropane, "For. q' yc y i e zlesthe outer endsof thenozzle andsleeve m'ay be located "h a ommo itr Ye S la lqck-nut.'on thetube QbafS against the, socket secured in metal-to-metalcontatattothebody end of the coupling andlocksthe assembly in adjusted position. Aheat-insulating air gap is provided between the sleeve and the nozzle.

Should the sleeve become damaged so it cannot be used, it can be easilyreplaced. Should the nozzle front end require trimming, all that need bedone is to screw the sleeve further into the coupling and lock it in itsnew position. Also, the sleeve covers the otherwise exposed lateralsurface portion of the nozzle, thereby preventing bending and marring ofthe nozzle.

Referring to the drawings:

Fig. 1 is an exploded view mainly in section of a blowpipe exemplifyingthe invention; and

Fig. 2 is a view mainly in section of the assembled parts shown in Fig.1.

The deseam'ing blowpipe B includes a head H and a nozzle N. The head His provided with an oxygen inlet 8, a socket l8 having a frusto-com'calfemale seat (2, an annular recess I4, a fuel gas inlet 16, afrusto-conical female seat 18, and a threaded portion 20. The inner endportion of the nozzle N is adapted to be inserted in the socket and isshaped to provide a frusto-conical male seat 22, an annular recess 24, afrusto-conical male seat 26, and an annular shoulder 28. When the nozzleand head are assembled, the female seats l2 and I8 fit the correspondingmale seats 22 and 26, so that leakage between the oxygen and fuel gasinlets as well as to the atmosphere is prevented. The seats arehermetically sealed by a hollow nut or coupling member C having athreaded male portion 36 engaging the threaded portion 26 of the socket.The inner end of the member C bears against the shoulder 28.

The member C is provided with an internally threaded socket 32 forreceiving the threaded inner end portion 34 of a protective sleeve S.The sleeve S is secured in adjusted position in the socket 32 on thecoupling member C by a lock-nut L. The outer surfaces of the socket 32and lock-nut L are non-circular or hexagonal for cooperation with awrench (not shown). The lock-nut is also provided with a protectingflange or skirt 35 surrounding the sleeve S in spaced relation.

The nozzle N comprises an elongated body composed of ductile metal, suchas copper having an outer annular surface portion 36 of constantdiameter, in the illustrated example, ex-

tending longitudinally from the shoulder '28 to r the outer end face 38of the nozzle. The corresponding internal annular surface 40 of thesleeve S is concentric with and radially spaced from the nozzle, therebyproviding an annular heat-insulating substantially dead air gap 42between the sleeve and the nozzle. Thus, the nozzle N and the sleeve Sare separated throughout the length of the sleeve by such air gap. Incases where the shape of the outer surface of the nozzle is not ofconstant diameter, the protective sleeve is shaped so that its innersurface corresponds to the outer surface of the nozzle, so as to provideinsulating space therebetween.

The parts of Fig. l are assembled as shown'in Fig. 2 with the outer end44 of the sleeve S flush with the end face 38 of the nozzle N. When thelength of the nozzle N is reduced by dressingback or when the nozzle isreplaced by one of different length, the axial position of the sleeve Smay be readily adjusted as desired. Also, when one side of the sleevewears, the sleeve may be circumferentially adjusted as desired.

The sleeve may be composed of any desired metal such as copper orstainless steel or nitrided steel. A hard metal facing 45 composed ofStellite alloy, for example, may be applied to the front end of thesleeve, when the latter is composed of softer metal such as steel oriron; but when the sleeve itself is composed of hard metal such facingmay be eliminated. In any case the invention is less costly thanproposals of the prior art, and the annular air space between the nozzleand the sleeve, being sealed at its inner end, provides an excellentinsulator which protects the nozzle from excessive heatmg.

What is claimed is:

1. In combination, a blowpipe head having a socket, a blowpipe nozzlehaving an end portion seated in such socket, a hollow coupling memberremovably connected to said head and securing said nozzle in place insuch socket, and a nozzle protective sleeve adjustably connected to saidhollow coupling member, said sleeve surrounding the adjacent outsidesurface portion of said nozzle in uniformly spaced relation throughoutthe length of the sleeve and extending axially at least to the outer endof the nozzle, said hollow coupling member cooperating with said nozzleand said sleeve to seal the inner end of the sleeve, the space betweenthe sleeve and nozzle containing substantialiy dead air which thermallyinsulates the nozzle from the sleeve.

2. The combination with a blowpipe head having a socket, a nozzle havingan end portion mounted in such socket, of a hollow nut threadedlysecuring said nozzle and head together, said hollow nut having a socket,a nozzle protective tube having one end adjustably threaded to thesocket portion of said hollow nut, and a lock-nut securing said tube inadjusted position to said hollow nut, said hollow nut and lock-nutcooperating with said nozzle to effectively seal the inner end of thesleeve.

3. A deseaming blowpipe comprising a head having a socket provided withat least one annular seat and a threaded portion, a nozzle having anannular seat fitting the corresponding seat in the socket, said nozzlealso having an annular shoulder, a hollow coupling member engaging saidthreaded portion of the socket and said shoulder, said member having asocket, a nozzle protective sleeve adjustably threaded to the socketportion of said hollow coupling memher and a lock-nut threaded to saidsleeve and engaging said member, said lock-nut having a sleevethread-protecting skirt surrounding the sleeve in spaced concentricrelation, and said hollow coupling member supporting said sleeve inradially spaced concentric relation with respect to said nozzle.

4. A nozzle protective sleeve combination for attachment to a blowpipehaving a head provided with a socket in which is secured one end of ablowpipe nozzle having an annular outside surface of substantiallyconstant diameter, said combination consisting of a hollow couplingmember adapted to threadedly engage such socket and secure the nozzle inplace with respect to the blowpipe head, said hollow coupling memberhaving a socket portion which is threaded, a nozzle protective sleevehaving an annular internal surface of substantially constant diameter,said sleeve also having a threaded end portion engaging the threadedsocket portion of the hollow coupling member, so that the sleeve can beadjusted axial- 1y as well as rotationally with respect to the couplingmember, and a lock-nut threaded to such threaded end portion of thesleeve and adapted to engage the end of the socket portion of the hol- 5low coupling member to secure the sleeve in adjusted position withrespect to the coupling member.

HOMER W. JONES.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 703,940 Menne July 1, 19021,264,516 Hendricks Apr. 30, 1918 Number Number

